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Database Forensics Database Forensics Oluwasola Mary Fasan Martin S Olivier ICSA, University of Pretoria ICSA, University of Pretoria South Africa South Africa [email protected] [email protected] Abstract Database forensics is a branch of digital forensics that has received little or no research attention. Even though various digital forensics investigations which rely on database forensics have been explored in theory and in practice, there is still no defined underlying model for any aspect of database forensics. The aim of our research is to define a formal process model for database forensics. This requires defining each of the phases which will be involved in database forensics and the process of reverting data manipulation operations on databases so that the information in a database at an earlier time can be regenerated during forensic investigations. This paper gives a brief introduction of database forensics and defines the context of our research. It also describes the methodology of the research and some of the results which have been achieved in the research. Some of the future work that needs to be completed in the research are also discussed in the paper. Keywords: Database forensics, digital forensics, forensics investigations. 1 Introduction The importance of databases in today’s commercial systems cannot be over-emphasized as databases are often used to store critical and sensitive information relating to an organization or her clients. Unfortunately, this important role played by databases has led to an increase in the rate at which databases are exploited in computer crimes. Since databases are often manipulated in order to facilitate suspicious acts, they are usually of interest during digital forensics investigation as useful information relevant to an investigation are frequently found therein. Digital forensics [5, 19] is an emerging branch of computer science that was primarily introduced to assist the law enforcement community in gathering evidences that can be used for prosecution from digital sources. Although advances in computer security research has led to the development of various security models in computer systems over the years, existing security models are still incapable of eliminating all possible attacks on computer systems. The investigation of undetected attacks is a challenging task as the log files found on most security systems are inadequate for a comprehensive investigation [20]. Digital forensics provide an effective investigation mechanism that can be used to capture, record, analyze and present evidences of attacks which can be used to hold an attacker amenable [5]. Database forensics is a branch of digital forensics that deals with the information found on database [18]. As with other branches of digital forensics, the purpose of database forensics is to help in determining the perpetrators of an attack and find out what was done. In addition, database forensics requires the ability to revert data manipulation operations and determine values contained in a database at an earlier time. However, despite the importance of databases, very little research has been done on database forensics or on defining a process for reverting data manipulation operations during forensics investigations. The aim of this research is to define the underlying theory of database forensics as well as a formal process model for database forensics. This will involve defining how data manipulation operations on a database can be reversed to retrieve the information in the database at some earlier time. The research will also involve a study of the phases involved in digital forensics (identification, preparation, preservation, collection, examination, analysis, and presentation) [19] and give a formal definition for those applicable in database forensics. This paper describes the research and the related work that has been done. It also describes the methodology and the results already obtained in the research. Some of the future work to be completed in the research are also highlighted. Section 2 describes the related works and section 3 describes the methodology. In section 4, we discuss some of the current achievements and results. The conclusions and some directions for future work are given in section 5. 2 Related Work Very little work has done database forensics despite its importance. The lack of research on the topic can be attributed to the inherent complexity of databases that is not yet fully understood in forensics sense. From a forensics perspective, databases are inherently multidimensional and thus require research from various dimensions [18]. In addition, another challenge faced in defining a general process model for database forensics is that there are significant differences in various database management systems (DBMS) which must be mastered [11]. Since each DBMS manages data using quite different mechanisms, these differences and/or mechanisms must be put into account in defining a general process model for database forensics. Moreover, even though the major purpose of digital forensics is to collect, identify, examine, correlate, analyze and document evidence from digital sources [19], database forensics requires that the information contained in a database can be determined. Although the information currently in a database can be determined by simply querying the database, much more effort is required in order to determine the information in a database at an earlier time. Some of the little work that has been done on database forensics includes the series of papers by Litchfield [12, 13, 14, 15, 16, 17] all of which focuses on Oracle forensics. Wright [23] published a book that explains Oracle forensics and investigates the possibility of using Oracle LogMiner [22] as a forensic tool. The little work has also been done on reversing of queries [2, 21] focus specifically on the generation of test databases and testing of DBMS performance [3, 4]. Even though these techniques can be used to generate good test databases, they cannot be used for forensics purposes as the databases often generated are non-deterministic in nature. That is, it is possible to generate more than one instance of the database with the same set of input and the decision procedure is left for a model checker [7] in order to guess the best result [2]. There is also a huge amount of literature on database debugging and recovery [2, 1]. Unfortunately, none of these previous works specifically addresses the underlying theory of database forensics or the general process of reverting data manipulation operations performed on database in order to determine the information in the database at an earlier time during forensic investigations. And this is what we aim to achieve in the research. 3 Methodology In order to achieve the objectives of this research, a detailed study of the digital forensics analysis process will be conducted to have a better understanding of the requirements and legal details relating to the presentation of evidence especially as it applies to database forensics. A review of existing digital forensics process models will also be done in order to determine which of the phases involved are applicable or requires modification in database forensics. The definition of each phase of database forensics will take into account security mechanisms built into databases as well as the type of database system, availability and/or extent of log records, and issues relating to integrity of such records. Although no prior work has been done on the regeneration of information that was in a database at an earlier time during forensics investigations, we aim to achieve this by employing ideas from the relational database model [8] since most DBMS support relational database model. Log records will be translated in relational algebra and inverse operations of the operations in databases will be defined. A formal process model for database forensics will be given by putting into consideration important contributions from other branches of digital forensics, the process definition of the phases involved and the definition of the reconstruction process for information previously in a database. Formalizing the process of outlining events carried out by a perpetrator (often called event reconstruction) on a database will explore the use of finite state models [6, 10] and formal verification techniques which will be analyzed with virtual models of event chain. The benefits and demonstrations of our process model for database forensics as well as the phases involved will be shown through real life examples. 4 Current Achievements, Results and Discussions We have developed an algorithm for the reconstruction of the information that was previously in a database [9]. Given as input the current instance of a database and the log of modifying queries that have been performed on the database, the database reconstruction algorithm determines the information that was in a relation on the database at an earlier time. The algorithm works based on the notion of inverse relational algebra and value blocks [9]. Since most databases support the relational database model, we have defined inverse operations for the relational algebra. The relational model for DBMS was developed by Codd [8] and describes how information stored in a database relates with each other. The model works on the notion that data can be manipulated based on the relational theory of mathematics and is composed of only one type of compound data known as a relation. Given a set of domains over which attributes are defined respectively, a relation R is a subset of the Cartesian product of the domains [8]. A relation may be conceived as a table where the columns of the table are the attributes, the rows are referred to as tuples and the domains define the data types of the attributes. The definition of the inverse operators for relational algebra works on the assumption that the database schema is known (both for the input and the expected output) and generates a result which is either a partial or a complete inverse of the query.
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